-21.35% is the change from 356 to 280
Calculation steps:
[( 280 - 356 ) ÷ 356] x 100 = -21.35%
Formula
Percentage change = [(280 - 356) / 356] x 100
Subtract the new number by the original number
280 - 356 = -76
-76 ÷ 356 = -0.21348314606741572
-0.21348314606741572 x 100 = -21.35%